Create Minimum Number of Rule Sets
The Assignment Manager is designed to return only one queue for every work item.
If two rules from different rule sets match a work item, then the Assignment Manager randomly picks between the rules. So the work item may not be assigned to the queue that you would want. To avoid such situations, it's good to have only one rule set if possible. And you can apply scoring for the rules if required. That way, only one rule matches a work item. Regardless of the company size, Oracle recommends deploying only one rule set.
Here's what the Assignment Manager does when you have multiple rule sets:
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The Assignment Manager checks all rule sets. In one round of assignment, it checks all the rules under Rule Set 1, all the rules under Rule Set 2, and so on.
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It finds some matching rules. Let's say the matching rules are Q1 and Q2 under Rule Set 1, and Q3 under Rule Set 2.
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It randomly picks a rule among Q1, Q2, and Q3.